She flexed her hands as he bound her, making sure they weren't so tight as to restrict blood flow. She was really upping the danger here, allowing herself to be bound and allowing...begging...him to fuck her ass. This was going to be far more extreme than she had ever experienced, and god she wanted it, but it scared her, too.

Those two fingers made her moan, her muscles extremely tight and clenching reflexively around the invading digits. His cock was so much bigger. She could have backed out, said no, used her safe word.

But god she wanted it.